Toki Yoriharu served as a bushō during the Sengoku and Azuchi-Momoyama periods.  Yoriharu was a kokujin, or provincial landowner, in Kazusa Province and served as the lord of Mangi Castle in the Isumi District of Kazusa.

Yoriharu was born as the son of Toki Tameyori, a retainer of the Satomi clan who, after the Second Battle of Kōnodai (from 1563 to 1564), switched his allegiance to the rival Hōjō clan.

Yoriharu engaged in repeated clashes against the Satomi family.  He acquired landholdings of 100,000 koku, fostering the period of peak prosperity and influence of the Kazusa-Toki family.